TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
System description
Page 47 of 164
If AT+UPSV=2 is set and HW flow control is disabled, the module monitors the RTS line to manage
the power saving configuration (for more details, see section
and u-blox AT Commands
, AT+UPSV):
When an OFF-to-ON transition occurs on the RTS input, the UART is enabled and the module is
forced to active-mode; after ~5 ms from the transition the switch is completed and data can be
received without loss. The module cannot enter low power idle-mode and the UART is keep enabled
as long as the RTS input line is held in the ON state
If the RTS input line is set to the OFF state by the DTE, the UART is disabled (held in low power
mode) and the module automatically enters low power idle-mode whenever possible
DSR signal behavior
If AT&S1 is set, as it is by default, the DSR module output line is set by default to the OFF state (high
level) at UART initialization. The DSR line is then set to the OFF state when the module is in command
mode
13
or in online command mode
and is set to the ON state when the module is in data mode
If AT&S0 is set, the DSR module output line is set by default to the ON state (low level) at UART
initialization and is then always held in the ON state.
DTR signal behavior
The DTR module input line is set by default to the OFF state (high level) at UART initialization. The
module then holds the DTR line in the OFF state if the line is not activated by the DTE: an active pull-up
is enabled inside the module on the DTR input.
Module behavior according to DTR status can be changed by AT command configuration (for more
details see the u-blox AT Commands Manual
, &D AT command description).
If AT+UPSV=3 is set, the DTR line is monitored by the module to manage the power saving
configuration (for more details, see section
, AT+UPSV):
When an OFF-to-ON transition occurs on the DTR input, the UART is enabled and the module is
forced to active-mode; after ~5 ms from the transition, the switch is completed and data can be
received without loss. The module cannot enter low power idle-mode and the UART is keep enabled
as long as the DTR input line is held in the ON state
If the DTR input line is set to the OFF state by the DTE, the UART is disabled (held in low power
mode) and the module automatically enters low power idle-mode whenever possible
DCD signal behavior
If AT&C1 is set, as it is by default, the DCD module output line is set by default to the OFF state (high
level) at UART initialization. The module then sets the DCD line according to the carrier detect status:
ON if the carrier is detected, OFF otherwise.
In case of voice calls, DCD is set to the ON state when the call is established.
If a Packet Switched Data call occurs before activating the PPP protocol (data mode), a dial-up
application must provide the ATD*99***<context_number># to the module: with this command the
module switches from command mode
and can accept PPP packets. The module sets
the DCD line to the ON state, then answers with a CONNECT to confirm the ATD*99 command. The
DCD ON is not related to the context activation but with the data mode.
13
For the definition of the interface data mode, command mode and online command mode see the u-blox AT Commands
Manual
